typography fixes;
static attr on const byte arrays;
refactor km_ecdsa_verify() to use a single heap allocation;
fix linuxkm_test_ecdsa_nist_driver() to copy sig and hash to a heap allocation before passing to sg_set_buf() (avoids unmapping of rodata);
in linuxkm_test_pkcs1_driver() move hash from stack to heap;
add LINUX_VERSION_CODE >= 5.4 assertion in linuxkm/lkcapi_glue.c;
streamline macro logic in linuxkm/lkcapi_sha_glue.c.